Preparation and Characterization of Reduced Graphene Nanosheets via Pre-exfoliation of Graphite Flakes

Meng, Long‐Yue; Park, Soo‐Jin

doi:10.5012/bkcs.2012.33.1.209

Cited by 62 publications

(28 citation statements)

References 28 publications

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“…As shown in Fig. 2, the C 1s spectra of the Ni(OH) 2 -graphene hybrid can be resolved (XPSPEAK, version 4.1) into three components, the main peak at binding energy of 284.5 eV is assigned to sp 2 hybridized C atoms in graphene, 8,39 and the broad weaker peaks at 285.9 eV and 288.4 eV are ascribed to the vestigial C-O species (epoxy or hydroxyls) on graphene, 8,39,40 manifested that graphene oxide was properly reduced during the hydrothermal process, and quality graphenes in the hybrid materials were achieved.…”

Section: Resultsmentioning

confidence: 99%

Chiseled Nickel Hydroxide Nanoplates Growth on Graphene Sheets for Lithium Ion Batteries

Tian

Wei

Zhuang

et al. 2013

NANO

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The morphologies and structures of Ni(OH) 2 -graphene hybrid materials were tailored by using di®erent mineralizers in this work. It was revealed that the synergic e®ects of the highly oxidized graphene sheets and the mineralizers played a crucial role in controlling the morphology and structure of the nanocomposites, and Na 2 CO 3 is a very e®ective mineralizer for growing chiseled 2D nanoplates of Ni(OH) 2 on graphene sheets. When produced with NaOH, fragmental Ni(OH) 2 crystals with irregular shapes erratically decorated on graphene sheets. In contrast, chiseled Ni (OH) 2 hexagonal nanoplates grown on graphene sheets were obtained when Na 2 CO 3 was used as the mineralizer. These unique 2D-2D nanoarchitectures with higher contact area between the nanocrystals and graphene substrate can increase the interfacial interaction and then e±ciently improve the structural stability of the composite material, thus exhibiting an enhanced Li storage capacity and excellent cycling performance of 562 mAh g À1 after the 36th cycle.

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Section: Resultsmentioning

confidence: 99%

Chiseled Nickel Hydroxide Nanoplates Growth on Graphene Sheets for Lithium Ion Batteries

Tian

Wei

Zhuang

et al. 2013

NANO

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“…7c) the intensity ratio of sp 2 /sp 3 carbons was found to be around 3.4 eV with the emergence of another band at 287.4 eV. This band may be the double bonds of carbonyl groups [39], formed on the side wall of fly ash nanoparticles. This is a very significant result, showing that functional groups can be introduced without chemical treatment, perhaps due to the ball milling in air.…”

Section: Structural and Optical Propertiesmentioning

confidence: 96%

“…6b and 7) sp 2 carbons are the main part of carbon rich fly ash. It is well understood in the literature that sp 2 carbon nanostructures like CNTs [20][21][22][23][24] and graphene [37,39] have unique mechanical properties. The value of the fraction ratio, i.e., 0.5 wt%, was chosen in the present study because this value was recommended as an optimum concentration by several authors, The typical XPS spectra of untreated (a), ultrasonically treated (b) and ball milled (c) carbon rich fly ash are presented in Fig.…”

Section: Structural and Optical Propertiesmentioning

confidence: 99%

Carbon rich fly ash and their nanostructures

Salah¹,

S²,

H³

et al. 2016

Carbon letters

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Carbon rich fly ash was recently reported to have compositions that are ideal for use as a precursor and catalyst for carbon nanotube growth. This fly ash powder is mostly composed of pure carbon, predominantly present as sp 2 . In this work, the effect of sonication time on the morphology and structural properties of carbon rich fly ash particles is reported. The obtained results show that ultrasound treatment is an effective tool for producing ultrafine particles/fragments with higher porosity, which might be suitable for the adsorption of gasses. Moreover, carbon nanoparticles (CNPs) of this fly ash were produced in parallel using the ball milling technique, and were evaluated as reinforcements for epoxy based composites. These CNPs have almost spherical shapes with particle sizes of around 30 nm. They were found to have strong C=O carbonyl group bonds, which might be generated during the ball milling process. The tensile testing results of a fly ash CNP reinforced epoxy composite showed significant improvements in the mechanical properties, mainly in the stiffness of the polymer. The stiffness value was increased by around 23% of that of neat epoxy. These CNPs with chemically active groups might also be useful for other applications.

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“…The interlayer distance of the graphite flakes and the various oxidation levels of GO nanoplatelets were increased throughout the chemical oxidation process. 25 During the oxidation process, oxygen functional groups, phosphate (PO 4 -) and sulphate (SO 4 -), insert themselves into the graphene layers. However, a slight reduction in interlayer spacing was observed from the 72 h processing time to 120 h processing time due to the behaviour of the phenol related band.…”

Section: Structural Analysismentioning

confidence: 99%

Tailoring the Chemical and Structural Properties of Graphene Oxide Nanoplatelets Synthesised at Room Temperature with Different Processing Times

Yee¹,

Ong²,

Ngee³

et al. 2017

JPS

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ABSTRACT:A simplified Hummer's method was successfully used in synthesising graphene oxide nanoplatelets. These nanoplatelets were synthesised at room temperature at various processing times (24 h, 72 h, and 120 h). Ultraviolet visible spectroscopy (UVvis) showed that all synthesised graphene oxide nanoplatelets suspensions have similar broad shoulder absorbance at a wavelength of 300 nm. Furthermore, similar functional groups were detected by Fourier transform infrared spectroscopy (FTIR) across all types of graphene oxide nanoplatelets structures. The effect of processing time on the thickness of the sheet size was interpreted through topology using atomic force microscopy (AFM). The structural properties of graphene oxide nanoplatelets were evaluated using X-ray diffraction (XRD). The results showed a slight increase in the interlayer spacing with no sharp distinction in the crystallinity for graphene oxide nanoplatelets at longer processing times. The ratio of carbon to oxygen composition on the surface of each synthesised graphene oxide nanoplatelet was computed using the X-ray photoelectron spectroscopy

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Preparation and Characterization of Reduced Graphene Nanosheets via Pre-exfoliation of Graphite Flakes

Cited by 62 publications

References 28 publications

Chiseled Nickel Hydroxide Nanoplates Growth on Graphene Sheets for Lithium Ion Batteries

Chiseled Nickel Hydroxide Nanoplates Growth on Graphene Sheets for Lithium Ion Batteries

Carbon rich fly ash and their nanostructures

Tailoring the Chemical and Structural Properties of Graphene Oxide Nanoplatelets Synthesised at Room Temperature with Different Processing Times

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